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11 Cards in this Set
- Front
- Back
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where is the nucleus of Clarke? what is it good for? what lamina layer is it?
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lamina V (in dorsal horn)
coordination in walking (relays info about legs) |
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what is contained in lamina IX?
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big alpha motor neurons (extrafusal muscle)
small gamma motor neurons (intrafusal) INTERNEURONS (Renshaw) that give negative feedback of alpha motor |
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describe the gradiente of white mater along the spinal cord. explain why
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ascending from lower spinal cord there is increasing white mater because:
at higher levels there is in accumulation of asons bringing sensory input from parts of body at lower levels there is a decrease in number of descending axons from brain |
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what is contained in gray matter in the following areas:
dorsal horn intermedeiolater horn ventral horn |
dorsal: receives axons of DRG, sensory
IML horn: thoracic and upper lumbar regions of cord, ANS function ventral horn: motor neurons exiting |
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blood supply to cord: what do the posterior and anterior spinal arteries supply? how many of each are there?
occlusion of which results in paralyisis? |
posterior (2): dorsal columns and posterior 1/3 of cord
anterior (1): pyramids of medulla, motor horn cells and anterior 1/3 of cord anterior |
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what is the artery of adamkewicz?
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an intercostal artery that supplements blood flood to the anterior spinal artery
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what are the small arteries that enter with spinal roots to help supply the cord?
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radicular arteries
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CLINICAL
describe how syringomyelia can tell us about what tracts have been injured |
cystic lesion that spreads out from central canal
If lesion centered at C6: normal touch, proprioception: dorsal columns intact bilaterally normal motor control below lesion: cortiocospinal tracts intact bilaterally intact pain and temp sensation from trunk and legs bilaterally: intact ALS on both sides |
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what is the function of the following 5 receptors:
mechanoreceptors chemo photo thermo noci |
mechano: mechanical deformation
chemo: chemicals photo: light energy thermo: temperature/temp change noci: tissue damage, pain |
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differentiate between the following sensory transducers based on location:
telereceptors exteroceptors enteroceptors proprioceptors |
tele: at distance from body (sight, hearing...)
extero: surface of the body entero: inside the body proprio: muscles and joints |
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how does recruitment occur in sensory conduction?
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as stiumuls increases, more afferents are recruited into activity
therefore if the field is small, it can be precisely located |
